Manufacturer product photo · industrial 16-port rack-mount serial device server
ZJTS816
Serial Device Server · 16-Port Rack-Mount
Industrial 16-Port Rack-Mount RS-232/485 Serial Device Server · Console Port · AC 220V
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◆16× RS-232/485 Ports
◆1U 19-Inch Rack-Mount
◆RS-232 Console Port
◆AC220V Wide-Range
◆IP40 Metal Enclosure
◆5-Year Warranty
Overview
The ZJTS816 is an industrial serial device server that brings up to 16 RS-232/485 serial ports onto the Ethernet network through 2 × 10/100Base-T auto-negotiating ports, with a dedicated RS-232 Console port (RJ45, 9600bps 8-N-1) for local configuration and management. It is housed in a standard 1U, 440mm-wide rack-mount metal chassis with IP40 protection, powered by AC 220V (85–264VAC/77–300VDC wide range) with reverse-polarity and overload protection, and supports DHCP/Telnet/TCP/UDP/IP/ICMP/ARP/Modbus TCP/IP protocols with a real COM driver for Windows. An optional wide-temperature build extends operation from -40 to +75°C with strong EMC immunity for demanding industrial environments.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
Legacy Serial Equipment to IP Networking16 × RS-232/485 ports let a single 1U unit bring an entire rack of legacy serial devices — PLCs, meters, sensors — onto the Ethernet network as a legacy serial to IP gateway.
PLC Automation Cell IntegrationBuilt-in Modbus TCP/IP protocol support (alongside DHCP/Telnet/TCP/UDP/IP/ICMP/ARP) lets the ZJTS816 bridge RS-232/485 PLC automation cells directly into a Modbus TCP/IP-based SCADA network.
Outdoor / Unconditioned Equipment RoomThe optional wide-temperature build operates from -40 to +75°C with strong EMC immunity, suited to unheated equipment rooms and outdoor cabinets exposed to seasonal extremes.
19-Inch Rack Cabinet InstallationStandard 1U height and 440mm rack width (with 466/483mm mounting-ear span) let the ZJTS816 mount directly into a 19-inch rack cabinet alongside other rack-mount networking gear, in an IP40 metal enclosure.
Console Port Local Debug & ManagementThe dedicated RS-232 Console port (RJ45 connector, 9600bps 8-N-1) gives technicians direct local access to configure and troubleshoot the unit without going over the network — useful during initial commissioning or when the Ethernet link is down.
1U High-Density 16-Port Serial AggregationA single 1U, 440mm rack-width chassis aggregates 16 RS-232/485 serial ports onto 2 × 10/100Base-T Ethernet uplinks, reducing rack space compared to deploying multiple smaller serial servers.
Not a good fit if:
- Powered by a single AC 220V (85–264VAC/77–300VDC) input only — no redundant dual-power-input option is listed for this series.
- IP40 enclosure only — needs a rack cabinet or additional protection for direct outdoor rain/dust exposure.
- Fixed 2 × 10/100Base-T Ethernet uplinks only — no gigabit or fiber uplink option; not intended as a high-throughput backbone aggregation switch.
Key Features
- 2 × 10/100Base-T auto-negotiating Ethernet ports for fast serial-to-IP networking
- High-performance 32-bit, 100MHz processor with ample memory
- Remote parameter configuration via network WEB browser
- Built-in 15KV ESD surge protection on all serial ports
- Flexible RS-232/485 serial port combination
- RS-232 Console port (RJ45, 9600bps 8-N-1) for local debug and management
- Terminal-block power connector for easy wiring · default 1U rack-mount installation
Specifications
Performance
| CPU | 32-bit, 100MHz |
| Memory | 2MB |
| Ethernet Rate | 10/100 Mbps auto-negotiating, manual setting supported |
| Communication Mode | 10M half/full duplex, 100M half/full duplex |
| Port Protection | 15KV electromagnetic isolation |
Serial Interfaces
| Ethernet Ports (RJ45) | 2 × 10/100Base-T(X) |
| Console Port | RS-232, RJ45 connector, 9600bps, 8-N-1 |
| Serial Ports | 16 × RS-232/485 (selectable) |
| Port Connector | RS-232/485 terminal-block interface |
Signal
| RS-232 Signal | TxD, RxD, GND |
| RS-485 Signal (2-Wire) | Data+, Data-, GND |
| Data Bits | 5, 6, 7, 8 |
| Parity | None, Even, Odd, Space, Mark |
| Stop Bits | 1, 2 |
| Flow Control | RTS/CTS, XON/XOFF |
Protocol & Driver
| Speed | 300 bps – 230.4 Kbps |
| Protocol | DHCP, Telnet, TCP, UDP, IP, ICMP, ARP, Modbus TCP/IP |
| Real COM Driver | Windows NT/2000/XP/Vista/7/10/11 |
Power
| 220V Input | 3-pin terminal; wide range 85–264VAC / 77–300VDC |
| Power Consumption | Max 4 W |
| Power Protection | Reverse-polarity & overload |
Physical
| Housing | IP40 metal enclosure |
| Mounting | Rack-mount (1U, 19-inch), default |
| Dimensions | 440 (W) × 44 (H) × 212 (D) mm |
Certification
| EMC | CE, FCC |
| EMI | FCC Part 15, EN 55032 (CISPR 32) Class A |
| EMS | EN61000-4-2/3/4/5/6/8 Level 3 |
| Shock | IEC60068-2-27 |
| Free Fall | IEC60068-2-32 |
| Vibration | IEC60068-2-6 |
| Green | RoHS, WEEE |
Environment
| Standard Temp | -10 ~ +60°C |
| Wide Temp | -40 ~ +75°C |
| Storage Temp | -40 ~ +85°C |
| Humidity | 5–95% non-condensing |
Reliability
| MTBF | 320,000 hours |
| Warranty | 5 years |
Models & Ordering
| Model | Product Description | Price |
|---|---|---|
| ZJTS816-S-232 | 16-port RS-232 serial device server — 2 × 10/100M auto-negotiating Ethernet, rack-mount, AC220V. | |
| ZJTS816-S-485 | 16-port RS-485 serial device server — 2 × 10/100M auto-negotiating Ethernet, rack-mount, AC220V. | |
| ZJTS816-M | 16-port RS-232/485 combo (2-in-1) serial device server — 2 × 10/100M auto-negotiating Ethernet, rack-mount, AC220V. |
This page covers the ZJTS816 series: -S-232 = 16 × RS-232 ports only; -S-485 = 16 × RS-485 ports only; -M = 16-port RS-232/485 combo (2-in-1, port-selectable). All three variants share 2 × 10/100Base-T Ethernet ports, an RS-232 Console port, and AC 220V (85–264VAC/77–300VDC) power. An optional wide-temperature (-40~75°C) build is available across the series. The requested model is ZJTS816.
Dimensions
unit: mm
Your Brand. Factory-Direct Supply.Neutral casing, ready for your logo · Custom port/power options · Small batches welcome.
Custom & OEM →Who uses it, where it goes and how to install it
Written for the ZJTS816 series from its own datasheet: 1U 19-inch rack, 16 × RS-232/485 serial ports, 300 bps to 230.4Kbps, 2 × 10/100Base-T(X) Ethernet, RS-232 console port, TCP/UDP and Modbus TCP/IP, virtual COM driver, 85–264VAC / 77–300VDC power.
Who it is for
- SCADA control rooms and substations — 16 RS-485 or RS-232 links from relays, RTUs and meters terminate in one rack unit next to the SCADA servers; the 77–300VDC input range covers a 110 V or 220 V station battery as well as 220 V mains.
- Network and telecom rooms — With the -S-232 version, the RS-232 console ports of up to 16 routers, switches or other rack equipment can be reached over the network for out-of-band configuration, with TxD/RxD/GND wired to each console.
- Water, gas and district-heating networks — A central pumping or boosting station with flow meters, analysers and drive controllers on separate RS-485 buses gets all 16 onto the SCADA through one Modbus TCP/IP gateway; the wide-temperature build (-40 ~ +75°C) suits unconditioned equipment rooms.
- Integrators with a 19-inch cabinet — The ZJTS816 takes 1U (440 × 44 × 212 mm) next to switches and servers, and the dedicated RS-232 console port (RJ45, 9600bps 8-N-1) allows local commissioning even before the network is up.
Where and how to install
- In the rack — Mounting is 1U 19-inch rack by default; the chassis is 212 mm deep, so it fits shallow wall cabinets too. Leave the 1U above or below free, or fit a cable-management panel, because 16 serial terminal cables plus 2 LAN cables arrive at one unit.
- Serial wiring and labelling — All 16 ports are terminal blocks: RS-232 TxD, RxD, GND, or RS-485 2-wire Data+, Data-, GND. Label each cable with the port number and the device it serves, use shielded twisted pair for RS-485 with the shield grounded at the rack end only, and keep the same Data+/Data- polarity on every device.
- Bus length and termination — As general practice, keep RS-232 runs to about 15 m; RS-485 can run up to about 1200 m at low baud rates, less at 115.2K or 230.4K. Wire RS-485 as a daisy chain, not a star, and fit 120 Ω termination only at the two far ends of each bus.
- Power — Power is AC220V only through a 3-pin terminal, accepting 85–264VAC or 77–300VDC, with reverse-polarity and overload protection; there is no 5–24VDC input on this model and no second power input. Feed it from the rack PDU on a UPS-backed circuit, or from the station DC system, and earth the chassis to the rack ground bar.
- Surge, ESD and environment — All 16 serial ports have 15KV ESD protection and the unit is tested to EN61000-4-5 surge Level 3; galvanic isolation is not listed, so put RS-485 surge protectors on every line that leaves the building. IP40 metal housing for equipment rooms and closed cabinets; standard -10 ~ +60°C, wide -40 ~ +75°C, 5–95% non-condensing.
Link planning: which ZJTS816 version
All three versions have 16 serial ports, 2 LAN ports, the RS-232 console and AC220V power in the same 1U chassis; only the serial interface type changes.
| ZJTS816-S-232 | ZJTS816-S-485 | ZJTS816-M | |
|---|---|---|---|
| Serial ports | 16 × RS-232 | 16 × RS-485 (2-wire) | 16 × RS-232/485 (2-in-1) |
| Signals | TxD, RxD, GND | Data+, Data-, GND | TxD, RxD, GND / Data+, Data-, GND |
| Typical cable length (general practice) | ~15 m | up to ~1200 m at low baud | ~15 m / up to ~1200 m |
| Baud rate | 300 bps – 230.4Kbps | 300 bps – 230.4Kbps | 300 bps – 230.4Kbps |
| Ethernet ports | 2 × 10/100Base-T(X) | 2 × 10/100Base-T(X) | 2 × 10/100Base-T(X) |
| Console port | RS-232, RJ45, 9600bps 8-N-1 | RS-232, RJ45, 9600bps 8-N-1 | RS-232, RJ45, 9600bps 8-N-1 |
| Peak serial data, all 16 ports at 230.4K | ~3.7 Mbps | ~3.7 Mbps | ~3.7 Mbps |
| Virtual COM driver | Windows NT/2000/XP/Vista/7/10/11 | Windows NT/2000/XP/Vista/7/10/11 | Windows NT/2000/XP/Vista/7/10/11 |
| Power input / consumption | 85–264VAC / 77–300VDC; max 4 W | 85–264VAC / 77–300VDC; max 4 W | 85–264VAC / 77–300VDC; max 4 W |
| Operating temperature | -10 ~ +60°C (wide -40 ~ +75°C) | -10 ~ +60°C (wide -40 ~ +75°C) | -10 ~ +60°C (wide -40 ~ +75°C) |
| Mounting / size | 1U rack, 440×44×212 mm | 1U rack, 440×44×212 mm | 1U rack, 440×44×212 mm |
- Pick -S-485 when most of the 16 ports serve meter, relay or sensor buses; one bus per port keeps each poll cycle short.
- Pick -S-232 for console servers and instruments in the same rack or room (about 15 m), and -M for a mixed installation.
Specifications from the ZJTS816 manufacturer datasheet. Peak serial data = 16 × 230.4 kbps; cable lengths are general RS-232/RS-485 practice, not datasheet values.
16-Port Serial Device Server FAQ — ZJTS816
What kind of equipment is the ZJTS816 meant for?
It brings up to 16 RS-232/485 serial devices — PLCs, SCADA field units and similar legacy gear — onto Ethernet through 2 × 10/100Base-T auto-negotiating ports. Each of the 16 ports is selectable between RS-232 and RS-485 on terminal-block interfaces, so mixed fleets connect to one 1U box.
How do I configure it locally on site?
A dedicated RS-232 Console port on an RJ45 connector runs at 9600 bps, 8-N-1 for local setup and management — useful when the network is not yet up. Over the network you get DHCP, Telnet, TCP, UDP, IP, ICMP, ARP and Modbus TCP/IP, plus a real COM driver for Windows NT through 11.
Does it fit a standard server rack?
Yes — it ships as a standard 1U, 19-inch rack-mount chassis, 440 mm wide and 44×212 mm in profile, with an IP40 metal enclosure. Rack mounting is the default, so 16 serial lines terminate cleanly in the same cabinet as your switches and servers.
What power supply does the ZJTS816 use?
AC 220V on a 3-pin terminal, with a wide tolerance of 85–264VAC / 77–300VDC — it rides through unstable grid voltage without an external stabilizer. Maximum draw is just 4 W, and reverse-polarity plus overload protection are built in.
Is there a version for extreme temperatures?
Yes. The standard build works -10 to +60°C; the optional wide-temperature build extends operation to -40 to +75°C, with storage rated -40 to +85°C and 5–95% non-condensing humidity. All serial ports carry 15KV electromagnetic isolation, EMC meets EN61000-4 Level 3, and the warranty is 5 years.
Can the ZJTS816 connect Modbus RTU meters to a SCADA that speaks Modbus TCP?
Modbus TCP/IP is in its protocol list, so this is the intended use: the SCADA polls the ZJTS816 over Ethernet and the unit forwards the requests to the RTU devices on its serial ports. The datasheet does not describe the gateway settings in detail (slave ID routing, response timeout), so send us your SCADA and meter models and we will confirm the setup before you order. If your software only speaks Modbus RTU on a COM port, use the virtual COM driver instead.
Which Windows versions does the ZJTS816 virtual COM driver support, and how many COM ports will I get?
The datasheet lists Windows NT/2000/XP/Vista/7/10/11. Each of the 16 serial ports is mapped to its own COM number on the PC, so software written for a local COM port keeps working without changes. Linux and macOS drivers are not listed; on those systems, or for new software, connect over TCP/UDP or Modbus TCP/IP instead of a virtual COM port. Ask us for the current driver and setup tool when you order.
How should I plan RS-485 buses across the 16 ports of the ZJTS816?
The datasheet gives no node limit per port. As general RS-485 practice, plan up to 32 standard unit loads per bus and up to about 1200 m at 9600 bps, daisy-chained with 120 Ω at both ends. With 16 ports, group devices by area or by type (for example one port per switchboard), so the ports poll in parallel and a wiring fault stays on one bus; 160 meters as 16 buses of 10 finish a read cycle about 16 times faster than one long bus.
Is the 10/100M Ethernet of the ZJTS816 fast enough for all 16 serial ports at full speed?
Yes, by a wide margin. Even with all 16 ports streaming continuously at the maximum 230.4Kbps, the serial data adds up to about 3.7 Mbps (16 × 230.4 kbps), well below the 100 Mbps port; real Modbus polling uses far less. The limits you will meet first are the serial side (baud rate, number of devices per bus, device response time) and the response timeout set in your SCADA, not the network port. Set the Ethernet port to auto-negotiate, or fix speed and duplex to match the switch port.
Do the two LAN ports on the ZJTS816 provide network redundancy?
Not as a listed feature: the datasheet gives 2 × 10/100Base-T(X) but no ring, RSTP, failover or dual-IP function, and the unit is a serial gateway, not a switch. Use the second port as an extra connection point (for example a local engineering laptop). If the link must survive a cable or switch failure, connect the ZJTS816 to an industrial ring switch and back up its power with a UPS; tell us your topology and we will confirm before you order.
Will polling through the ZJTS816 be slower than a direct serial cable?
Slightly: the datasheet gives no latency figure, but every request now also crosses the Ethernet network and the unit's buffer, which on a local LAN usually adds only a few milliseconds compared with the serial transmission itself. Over Wi-Fi, VPN or 4G links the delay can be much larger, so raise the response timeout in your SCADA or software (for example from 100 ms to 500–1000 ms) and avoid two masters polling the same port at the same time. Use the highest baud rate all devices on the bus support to shorten each poll.
What power connector does the ZJTS816 have, and do I need to confirm it before ordering?
Yes, please confirm the power connector with us before ordering. For Zhongxin Shutong products the power input type and connector can differ between versions and batches, so tell us your supply (AC or DC and the voltage), how you will wire it in the cabinet and your country's plug standard, and we confirm the exact connector and supply version of the ZJTS816 for your order.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
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